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在第二次土壤普查基础上,于2006年5—6月对不同水热梯度下封丘、临泽和阜康3个地区农田土壤速效钾含量进行全面调查,分析不同地区农田土壤速效钾的时间变异特征。研究结果表明,影响不同水热梯度带农田土壤钾素含量水平和近20多年来变化程度的主要因素是成土母质和耕作管理水平;耕层土壤速效钾平均含量以阜康地区最高、封丘地区其次、临泽地区最低;自东向西土壤速效钾含量的变化与水热梯度差异未呈现显著相关性;经过20多年的耕作种植,3个研究区耕层土壤速效钾含量普遍下降,临泽地区降低幅度最大(50.08%),其次为封丘(39.11%)和阜康(27.40%);利用地统计学方法对3个地区土壤速效钾含量进行空间结构分析,结果表明,封丘和临泽地区土壤速效钾主要受结构性因素影响而呈强空间相关性,阜康地区速效钾受结构性和随机性因素共同作用而呈中等空间相关性。
Based on the second soil survey, from May to June 2006, the available soil potassium content of farmland in Fengqiu, Linze and Fukang under different hydrothermal gradients was investigated comprehensively, and the contents of available potassium Time variation characteristics. The results showed that the main factors affecting the soil potassium content and the degree of change in the past 20 years were soil parent materials and tillage management levels. The average content of available potassium in topsoil was the highest in Fukang, In the second place, Linze area was the lowest. There was no significant correlation between the change of available potassium content and the hydrothermal gradient from east to west. After more than 20 years of cultivation, the available potassium content of topsoil declined in general. (50.08%) in Ze area, followed by Fengqiu (39.11%) and Fukang (27.40%). Spatial structure analysis of soil available K in the three areas was conducted by using geostatistics. The results showed that Fengqiuhe The soil available potassium in Linze area was strongly influenced by structural factors, and the available potassium in Fukang area was moderately correlated by both structural and random factors.